Screw Gauge

Q.

The observed reading of the thickness of a glass plate measured with a screw gauge is $2.33$ mm. The zero error is $-0.03$ mm (negative). What is the correct thickness of the plate?

Q.

A student uses a screw gauge to measure the diameter of a wire. However it has a zero error as shown below when it is used to take a reading, it must be corrected by

1. adding 0.2 mm

2. subtracting 0.2 mm

3. adding 0.2 mm

4. subtracting 0.02 mm

Q. Which of the following is/are true about screw gauge?

1. Screw gauge is used to measure dimensions of very small objects.
2. Screw gauge is used to measure dimensions of large objects
3. Screw gauge works under the principle of a screw.
4. Screw gauge is used to measure the dimension of a cricket ball

Q.

What is the reading of the following screw gauge?

1. 7.74 mm

2. 8.14 mm

3. 6.74 mm

4. 7.14 mm

Q. A beaker $20cm$ high is half filled with an oil of refractive index $1.40$ and the upper half filled with water of refractive index $1.33$. What is the apparent depth of the beaker as observed normally?